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Thread: pentair minimax 400 natural gas heater

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    Join Date
    Aug 2015
    Leonia, New Jersey

    pentair minimax 400 natural gas heater

    I have been having problems. the unit is around 13 yrs old. I just replaced the Ignition mod and the therm board. I have checked all sensors and found them to be in working order. I thought maybe the gas valve is going bad. The heater runs and then the service light comes onIt will restart after a few minutes and continues this cycle. Please help. Thank you

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    In the Industry
    ps0303's Avatar
    Join Date
    Jul 2011

    Re: pentair minimax 400 natural gas heater

    With intermittent problems like this, you need to be monitoring the voltage on the sensors as one of them is dropping out for a second or two. It's going to be hard to catch the one acting up and might take you some time to find it. You could jumper one out at a time and let the unit run and if the unit stays running with X sensor jumped out, that's your problem child.

    A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you.

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